Last updated: June 24, 2025
In Valparaiso, United States, the average temperature in December is a brisk 0°C (32°F). Temperatures can swing dramatically, with a minimum of -25°C (-12°F) and a maximum reaching 21°C (69°F). Expect 41 mm (1.6 in) of precipitation spread over approximately 4 days, contributing to an average humidity of a damp 83%.
In December in Valparaiso, the average temperature is 0°C (32°F). The maximum can reach 21°C (69°F) and the minimum can be as low as -25°C (-12°F). Be prepared for a wide range of temperatures, making it essential to pack layers and plan activities accordingly.
In Valparaiso in December, the precipitation amount is 41 mm (1.6 in) over the course of 4 days.
In Valparaiso in December, humidity is 83%. With an average temperature of 0°C (32°F), this humidity feels like traveling through a thick mist, making every step heavy and the cold pierce even deeper, causing you to constantly seek shelter or warm beverages to counteract the damp chill.
In Valparaiso in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Valparaiso, you can visit Hourly UV Index in Valparaiso.
UV Risk Categories
Weather in Valparaiso varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Valparaiso, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (26°F) | 33 mm (1.3 inches) | 76% | moderate |
| February Weather | -3°C (26°F) | 27 mm (1.1 inches) | 80% | moderate |
| March Weather | 5°C (42°F) | 98 mm (3.8 inches) | 73% | high |
| April Weather | 10°C (51°F) | 48 mm (1.9 inches) | 74% | very high |
| May Weather | 17°C (63°F) | 139 mm (5.5 inches) | 78% | very high |
| June Weather | 25°C (77°F) | 108 mm (4.3 inches) | 82% | very high |
| July Weather | 26°C (79°F) | 74 mm (2.9 inches) | 83% | very high |
| August Weather | 24°C (76°F) | 92 mm (3.6 inches) | 80% | very high |
| September Weather | 21°C (70°F) | 80 mm (3.2 inches) | 75% | very high |
| October Weather | 12°C (53°F) | 115 mm (4.5 inches) | 75% | high |
| November Weather | 5°C (41°F) | 29 mm (1.1 inches) | 82% | moderate |
| December Weather | 0°C (32°F) | 41 mm (1.6 inches) | 83% | low |